Psi2 Aquarii
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 Location of ψ2 Aquarii (circled) |
|
| Observation data Epoch J2000 Equinox J2000 |
|
|---|---|
| Constellation | Aquarius |
| Right ascension | 23h 17m 54.21372s[1] |
| Declination | –09° 10′ 57.0675″[1] |
| Apparent magnitude (V) | 4.403[2] |
| Characteristics | |
| Spectral type | B5 Vn[3] |
| U−B color index | –0.561[2] |
| B−V color index | –0.146[2] |
| Variable type | Periodic Be star |
| Astrometry | |
| Radial velocity (Rv) | -6[4] km/s |
| Proper motion (μ) | RA: +17.13[1] mas/yr Dec.: –11.70[1] mas/yr |
| Parallax (π) | 8.12 ± 0.38[1] mas |
| Distance | 400 ± 20 ly (123 ± 6 pc) |
| Details | |
| Radius | 4.6[5] R☉ |
| Temperature | 15,212 ± 288[5] K |
| Rotational velocity (v sin i) | 341[6] km/s |
| Other designations | |
Psi2 Aquarii is the Bayer designation for a star in the equatorial constellation of Aquarius. It is visible to the naked eye with an apparent visual magnitude of 4.4.[2] Based upon parallax measurements made during the Hipparcos mission, the distance to this star is roughly 400 light-years (120 parsecs).[1]
This is a B-type main sequence star with a stellar classification of B5 Vn.[3] The 'n' suffix indicates that the absorption lines in the spectrum are being broadened by Doppler shift from the star's rapid rotation rate. The projected rotational velocity of the star is 341 km/s.[6] Psi2 Aquarii is 4.6[5] times as large as the Sun with an effective temperature of 15,212 K[5] in its outer envelope.
It is a Lambda Eridani or periodic Be star with a pulsation cycle lasting 1.073 days.[8] The amplitude of the variation is 0.024 in magnitude.[9]
References
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- ↑ 2.0 2.1 2.2 2.3 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 3.0 3.1 Lua error in package.lua at line 80: module 'strict' not found.
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- ↑ 5.0 5.1 5.2 5.3 Lua error in package.lua at line 80: module 'strict' not found.
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